Line graph: number of new cases on left with numbers increasing towards top of graph in inicrements of twenty-five from twenty-five to two-hundred. Numbers one through nine at bottom of graph, each one depicting a week. The graph legends shows ninth graders are the red line on the chart, the tenth graders are the green line on the chart, the eleventh graders are the blue line on the chart, and the twelfth graders are the purple line.

The red line rises from twenty-five to approximately one-hundred-thirty-seven in the first week and remains there until the fourth week. It then drops to seventy-five by week six and on to thirty-seven by week nine.

The green line starts at approximately one-hundred and twelve in week one and drops to one-hundred in week three. It then rises to one-hundred and twelve again by week six and to one-hundred-sixty through to week nine.

The blue line remains constant at eighty-seven throughout all nine weeks.

The purple line starts at sixty-two, rises to seventy-five at two weeks and to one-hundred-twenty-five at four weeks. It then rises to one-hundred-thirty-seven at week six and remains there through to week nine.